TM 9-2350-256-10 2-11.  OPERATING PROCEDURES-Continued. (6) FUEL CONTROL VALVES.    Four  fuel  control  valves  (7)  thru  (10)  are  located  on  rear  crew  compartment wall.    They  are  used  to  open  or  close  fuel  tank  and  drain  valves.    Refer  to  following  tables  for  fuel  valve positions during operation and for draining tanks. CAUTION Before   operating   vehicle,   FUEL   CONTROL   VALVE   FORWARD   TANK   must   be closed. NOTE If right and left rear tanks are too low for APU operation, OPEN forward tank valve (8).  Close valve when finished. Operation Fuel Valve Positions Right Rear Forward Drain Left Rear Tank (7) Tank (8) Valve (9) Tank (10) Normal Open Closed Closed Open Operation Refuel-Defuel Open Closed Closed Open (Diesel Fuel Only) APU Operation Open Closed Closed Open Draining Tanks Forward Closed Open Open Closed Right Rear Open Closed Open Closed Left Rear Closed Closed Open Open 2-150